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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/m32r/kernel/process.c
2 * linux/arch/m32r/kernel/process.c
4 * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
6 * Taken from sh version.
7 * Copyright (C) 1995 Linus Torvalds
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 #define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
16 #define DPRINTK(fmt, args...)
20 * This file handles the architecture-dependent parts of process handling..
24 #include <linux/config.h>
25 #include <linux/module.h>
26 #include <linux/ptrace.h>
27 #include <linux/unistd.h>
28 #include <linux/slab.h>
29 #include <linux/hardirq.h>
32 #include <asm/uaccess.h>
33 #include <asm/mmu_context.h>
37 #include <linux/err.h>
39 static int hlt_counter
=0;
42 * Return saved PC of a blocked thread.
44 unsigned long thread_saved_pc(struct task_struct
*tsk
)
46 return tsk
->thread
.lr
;
50 * Powermanagement idle function, if any..
52 void (*pm_idle
)(void) = NULL
;
54 void disable_hlt(void)
59 EXPORT_SYMBOL(disable_hlt
);
66 EXPORT_SYMBOL(enable_hlt
);
69 * We use this is we don't have any better
72 void default_idle(void)
74 /* M32R_FIXME: Please use "cpu_sleep" mode. */
79 * On SMP it's slightly faster (but much more power-consuming!)
80 * to poll the ->work.need_resched flag instead of waiting for the
81 * cross-CPU IPI to arrive. Use this option with caution.
83 static void poll_idle (void)
90 * The idle thread. There's no useful work to be
91 * done, so just try to conserve power and have a
92 * low exit latency (ie sit in a loop waiting for
93 * somebody to say that they'd like to reschedule)
97 /* endless idle loop with no priority at all */
99 while (!need_resched()) {
100 void (*idle
)(void) = pm_idle
;
107 preempt_enable_no_resched();
113 void machine_restart(char *__unused
)
115 printk("Please push reset button!\n");
120 void machine_halt(void)
122 printk("Please push reset button!\n");
127 void machine_power_off(void)
132 static int __init
idle_setup (char *str
)
134 if (!strncmp(str
, "poll", 4)) {
135 printk("using poll in idle threads.\n");
137 } else if (!strncmp(str
, "sleep", 4)) {
138 printk("using sleep in idle threads.\n");
139 pm_idle
= default_idle
;
145 __setup("idle=", idle_setup
);
147 void show_regs(struct pt_regs
* regs
)
150 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
151 regs
->bpc
, regs
->psw
, regs
->lr
, regs
->fp
);
152 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
153 regs
->bbpc
, regs
->bbpsw
, regs
->spu
, regs
->spi
);
154 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
155 regs
->r0
, regs
->r1
, regs
->r2
, regs
->r3
);
156 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
157 regs
->r4
, regs
->r5
, regs
->r6
, regs
->r7
);
158 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
159 regs
->r8
, regs
->r9
, regs
->r10
, regs
->r11
);
160 printk("R12[%08lx]\n", \
163 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
164 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
165 regs
->acc0h
, regs
->acc0l
);
166 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
167 regs
->acc1h
, regs
->acc1l
);
168 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
169 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
170 regs
->acch
, regs
->accl
);
172 #error unknown isa configuration
177 * Create a kernel thread
181 * This is the mechanism for creating a new kernel thread.
183 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
184 * who haven't done an "execve()") should use this: it will work within
185 * a system call from a "real" process, but the process memory space will
186 * not be free'd until both the parent and the child have exited.
188 static void kernel_thread_helper(void *nouse
, int (*fn
)(void *), void *arg
)
194 int kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
)
198 memset(®s
, 0, sizeof (regs
));
199 regs
.r1
= (unsigned long)fn
;
200 regs
.r2
= (unsigned long)arg
;
202 regs
.bpc
= (unsigned long)kernel_thread_helper
;
204 regs
.psw
= M32R_PSW_BIE
;
206 /* Ok, create the new process. */
207 return do_fork(flags
| CLONE_VM
| CLONE_UNTRACED
, 0, ®s
, 0, NULL
,
212 * Free current thread data structures etc..
214 void exit_thread(void)
217 DPRINTK("pid = %d\n", current
->pid
);
220 void flush_thread(void)
222 DPRINTK("pid = %d\n", current
->pid
);
223 memset(¤t
->thread
.debug_trap
, 0, sizeof(struct debug_trap
));
226 void release_thread(struct task_struct
*dead_task
)
229 DPRINTK("pid = %d\n", dead_task
->pid
);
232 /* Fill in the fpu structure for a core dump.. */
233 int dump_fpu(struct pt_regs
*regs
, elf_fpregset_t
*fpu
)
235 return 0; /* Task didn't use the fpu at all. */
238 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long spu
,
239 unsigned long unused
, struct task_struct
*tsk
, struct pt_regs
*regs
)
241 struct pt_regs
*childregs
;
242 unsigned long sp
= (unsigned long)tsk
->thread_info
+ THREAD_SIZE
;
243 extern void ret_from_fork(void);
246 sp
-= sizeof (struct pt_regs
);
247 childregs
= (struct pt_regs
*)sp
;
250 childregs
->spu
= spu
;
251 childregs
->r0
= 0; /* Child gets zero as return value */
253 tsk
->thread
.sp
= (unsigned long)childregs
;
254 tsk
->thread
.lr
= (unsigned long)ret_from_fork
;
260 * fill in the user structure for a core dump..
262 void dump_thread(struct pt_regs
* regs
, struct user
* dump
)
268 * Capture the user space registers if the task is not running (in user space)
270 int dump_task_regs(struct task_struct
*tsk
, elf_gregset_t
*regs
)
276 asmlinkage
int sys_fork(unsigned long r0
, unsigned long r1
, unsigned long r2
,
277 unsigned long r3
, unsigned long r4
, unsigned long r5
, unsigned long r6
,
281 return do_fork(SIGCHLD
, regs
.spu
, ®s
, 0, NULL
, NULL
);
284 #endif /* CONFIG_MMU */
287 asmlinkage
int sys_clone(unsigned long clone_flags
, unsigned long newsp
,
288 unsigned long parent_tidptr
,
289 unsigned long child_tidptr
,
290 unsigned long r4
, unsigned long r5
, unsigned long r6
,
296 return do_fork(clone_flags
, newsp
, ®s
, 0,
297 (int __user
*)parent_tidptr
, (int __user
*)child_tidptr
);
301 * This is trivial, and on the face of it looks like it
302 * could equally well be done in user mode.
304 * Not so, for quite unobvious reasons - register pressure.
305 * In user mode vfork() cannot have a stack frame, and if
306 * done by calling the "clone()" system call directly, you
307 * do not have enough call-clobbered registers to hold all
308 * the information you need.
310 asmlinkage
int sys_vfork(unsigned long r0
, unsigned long r1
, unsigned long r2
,
311 unsigned long r3
, unsigned long r4
, unsigned long r5
, unsigned long r6
,
314 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, regs
.spu
, ®s
, 0,
319 * sys_execve() executes a new program.
321 asmlinkage
int sys_execve(char __user
*ufilename
, char __user
* __user
*uargv
,
322 char __user
* __user
*uenvp
,
323 unsigned long r3
, unsigned long r4
, unsigned long r5
,
324 unsigned long r6
, struct pt_regs regs
)
329 filename
= getname(ufilename
);
330 error
= PTR_ERR(filename
);
331 if (IS_ERR(filename
))
334 error
= do_execve(filename
, uargv
, uenvp
, ®s
);
337 current
->ptrace
&= ~PT_DTRACE
;
338 task_unlock(current
);
346 * These bracket the sleeping functions..
348 #define first_sched ((unsigned long) scheduling_functions_start_here)
349 #define last_sched ((unsigned long) scheduling_functions_end_here)
351 unsigned long get_wchan(struct task_struct
*p
)